JP2007271451A - Position specifying system using specified low power radio system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To locate a transceiver by designing a laying, form by combining an antenna and a receiving device indoors or outdoors. <P>SOLUTION: The transmitting/receiving area is freely set in space by combining two or more receiving devices and a line-like antenna, such as an LCX (Leaky Coaxial Cable), and the position recognition of the transceiver of the specified low power radio system is allowed. Especially, an attenuator and compositor are interposed between the line-like antenna and the receiving device, thereby allowing free-shape setting of the area. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a position specifying technique based on a low power wireless system using a leaky coaxial cable.

  Recently, mobile phones have become widespread and are said to be an era of one by one, and it seems that information can be exchanged anytime and anywhere.

  However, the use of mobile phones is prohibited in hospitals and factories equipped with electronic devices. This is because the inspection devices and surgical devices provided in hospitals are equipped with precise electronic devices, and malfunctions occur due to radio waves transmitted from mobile phones, which impede medical practice. This is because even in a factory equipped with an electronic device, the electronic device malfunctions due to the radio waves transmitted from the mobile phone, which hinders the manufacture of the product.

  Such malfunctions are not only caused by mobile phones, but also occur everywhere due to noise generated by electronic and electrical products, and these generated noises cause other electronic and electrical products. There has also been a situation of functional impairment. Such a phenomenon is generally referred to as EMC (electromagnetic environment compatibility), and nowadays, how to avoid electromagnetic environment disturbance caused by this EMC has become a big social problem.

  In such hospitals and factories that prohibit the use of mobile phones, in order to communicate information with doctors, nurses, or employees, it is weak enough not to affect electronic devices, From these doctors, nurses, or employees, it is necessary to communicate with radio waves having a very short radio wave reach that is unlikely to reach the electronic devices present in the surroundings.

  In the radio law, a specific low-power radio system with an antenna power of 0.01 watt or less is recognized, and a transceiver can be used. Although this transceiver is used because it is said that the radio wave is weak and it has little influence on electronic devices, it is designed to be able to communicate even as far as possible from each other, so there is a shield. Because it becomes difficult to receive, or the reception range is too wide, and it is possible to communicate up to a transceiver at an unintended position, the accuracy of specifying the position of which transceiver has received has deteriorated. .

  For this reason, it becomes difficult to specify the position of the owner of the transceiver to be confirmed in an emergency or at night. In particular, the use in an emergency cannot be put into practical use.

  It is conceivable to devise the antenna, but in the case of a single type antenna such as a whip antenna, this type of transceiver has characteristics that the simplicity of the structure and the horizontal directivity of the antenna can be received uniformly over 360 degrees. However, it is unsuitable for position determination because it receives radio waves from all directions.

On the other hand, the Yagi-Uda antenna, which has been used for a long time as an antenna having directivity in a certain direction, has a wider receiving range as the distance from the antenna increases, and has a horizontal directivity characteristic like a fan. In search of sharper horizontal directivity, there are parabolic antennas and horn antennas, but the antenna becomes large and is not practical.
JP 2005-27134 A

  The present invention has been made in view of such points, and uses a transceiver that does not require a radio station license, but avoids difficult reception by a shielding object, reception at an unintended position, etc. It is a technical problem to be able to immediately and accurately specify the position of a transceiver owner in a predetermined area at any time, regardless of whether it is normal, emergency, daytime or nighttime.

  In order to solve the above problems, the present invention employs the following means.

  According to a first aspect of the present invention, there is provided at least two or more receiving devices, line-type antennas for each system connected to the two or more receiving devices and laid in a two-dimensional direction or a three-dimensional direction of the space, and the space A specific low-power radio system in which communication with a transceiver located within is comprised of an information processing device that identifies the position of the transceiver based on transmission / reception information from a receiving device via any one or more of the line antennas This is a position identification system that uses.

  Here, the two-dimensional direction means an outdoor or indoor plane direction, and an area in which this plane can be transmitted and received can be freely generated and set by a combination of the laying position of the line cable and the receiving device.

  For example, if transmission / reception with a transceiver that can be performed by only one receiving device is possible, information indicating that there is an operator or guard who has the transceiver in the transmission / reception area of a line cable connected to that receiving device. The processing device can recognize it.

  Further, when transmission / reception is possible from a plurality of receiving apparatuses, the information processing apparatus can recognize that there are workers and guards who have transceivers at positions where the transmission / reception areas of the respective line cables overlap.

  As described above, in the present invention, since one or more line-shaped cables are used as receiving antennas, all the places where the cables are laid serve as transmitting / receiving antennas. Specific area) can be set.

  According to a second aspect of the present invention, there is provided the specific low power radio according to the first aspect, wherein attenuation means for limiting a transmission / reception range with the transceiver is interposed between the line antenna and the receiving device. This is a location system using a method.

  As described above, the transmission / reception range of the line antenna can be limited (controlled) by interposing an attenuation means (for example, an attenuator (ATT)) to the line antenna. That is, by intentionally constraining the reception level of the line antenna by the attenuating means, it is possible to subdivide the area and to recognize the position with higher accuracy.

  According to a third aspect of the present invention, a plurality of line antennas are connected to one receiving device, and a single transmission / reception composed of a plurality of line antennas is provided between the plurality of line antennas. The position specifying system using the specific low-power radio system according to claim 1 or 2, wherein combining means for combining the transceiver transmission / reception information from the range is interposed.

In this way, by connecting a plurality of line antennas to the receiving device via the combining means (synthesizer), it becomes possible to freely set an area depending on the laying shape of the line antenna. For example, if the line antennas are laid in a triangular shape or a quadrangular shape, and the receivable areas of these line antennas are combined, the triangular or quadrangular area can be set.

  According to a fourth aspect of the present invention, the line antenna described in the first to third aspects is constituted by a leaky coaxial cable.

Here, the leaky coaxial cable is called LCX (Leaky Coaxial Cable) and has a diameter of 5 cm.
A zigzag slot (elongated hole) is opened in the outer conductor of a coaxial cable, and it is used as an antenna for emitting and receiving radio waves, usually in a long structure space such as a tunnel Although used, conventionally, only a connection technique for maintaining a high signal level as an antenna has been studied.

  The present inventor freely lays this leaky coaxial cable as a line antenna to set a transmission / reception area with the transceiver (Claim 1), and further sets the area by interposing attenuation means as necessary. Further, the transmission / reception area can be set in a free space shape by combining a plurality of antennas (claim 2).

  In addition to the above, a fifth aspect of the present invention further includes a directional antenna having a transmission / reception characteristic in a fan-shaped range, and transmission / reception state information from a receiving device to which the leaky coaxial cable is connected, and the directivity The position specifying system using the specific low-power radio system according to any one of claims 1 to 4, wherein the position of the transceiver is specified from transmission / reception information of a directional antenna.

  In the system of claim 5, the position of the transceiver can be recognized even in a wide space such as a ground or a schoolyard by combining with a directional antenna (for example, Yagi-Uda antenna) having transmission and reception characteristics within a fan-shaped range. It is a thing.

  According to the present invention, in communication by a specific low-power radio system, a free transmission / reception area can be set by devising a laying format by a combination of a line antenna and a receiving device, indoors or outdoors, The position of the transceiver can be specified with high accuracy.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a device configuration of the position specifying system of the present invention.

The transceiver is a specific power-saving radiotelephone device, and is a transceiver with an output of 0.01 watt and a 400 MHz band that does not require a license application.

  The receiving unit includes a leaky coaxial cable, an attenuator (ATT), a combiner, and a receiving device.

  Although not shown, the leaky coaxial cable has a structure in which a zigzag slot (elongated hole) is formed in the outer conductor of the coaxial cable having a diameter of about 5 cm so that radio waves can be emitted and received. .

  The attenuator (ATT) is for controlling the output (reception level) of the leaky coaxial cable.

  Thus, by connecting an attenuator for each leaky coaxial cable, the send / receive area of the leaky coaxial cable can be intentionally controlled to narrow the send / receive area.

  Furthermore, in this embodiment, the attenuator connected to the leaky coaxial cable is connected to the receiving device via the combiner. The combiner can combine the transmission / reception areas of a plurality of leaky coaxial cables. That is, when the leaky coaxial cables are laid in parallel, the transmission / reception area can be widened in a plane. In addition, when the leaky coaxial cable is laid in a quadrangular shape or a triangular shape, it is possible to freely set a rectangular or triangular transmission / reception area. Furthermore, a free area shape can be produced by individually controlling the attenuation amount of the attenuator that terminates each leaky coaxial cable.

  FIG. 3 shows the relationship between the attenuation amount of the actual leaky coaxial cable and the transmission / reception distance in an experimental example. For example, when a 40 dB attenuator is connected to a leaky coaxial cable having a transmission / reception distance of 25 m, the transmission / reception distance can be reduced to 1 m. In other words, by attenuating and narrowing the transmission / reception range, only transceivers that are very close to the line antenna can be transmitted and received, but not to transceivers located far away, and as a result, the transceiver owner's location can be confirmed more accurately It can be done.

  FIG. 2 shows a hardware configuration of the information processing apparatus.

  The hardware used in the present embodiment is an information processing apparatus such as a general-purpose personal computer, and a main memory (MM) connected by a bus (BUS) around a central processing unit (CPU), a large-scale storage A hard disk device (HD) as a device, a keyboard (KBD) as an input device, a mouse (not shown) as an auxiliary input device, a display device (DISP) as an output device, a printer device (not shown), etc. Has been.

  The bus (BUS) can be connected to the receiving unit (receiving device) described in FIG. 1 via an input / output device (I / O).

  Various processing programs are registered in the hard disk device (HD) together with the operating system (OS). As these processing programs, specifically, a transmitting unit location specifying / management program of a transceiver, any receiving device based on received information from a receiving device received via an input / output device (I / O) An execution program based on an algorithm that analyzes whether or not communication with a transceiver is possible and identifies the position of the transceiver is registered.

  In the various tables, a table for registering the ID of the receiving device for the location specifying / management program is set. Further, a database for registering specific / management records may be registered in the hard disk device (HD).

  In the position specifying function of the transceiver of this embodiment, the central processing unit (CPU) reads and executes the position specifying / management program via the bus (BUS) and the main memory (MM) while referring to various tables. Has been realized.

  FIG. 4 shows the position specifying system of the present invention specialized in a two-dimensional space.

In the figure, a space (for example, one room) is divided into nine areas (AR1 to AR9). In the figure, upper left (AR1), upper right (AR3), lower left (AR7), lower right ( The receiving devices 1a to 1d are arranged in each area of AR9). This receiver 1a ~
In 1d, leaky coaxial cables 1aAnt to 1dAnt are led out as antennas.

  Each of the receiving apparatuses 1a to 1d is connected to the information processing apparatus 3, and the information processing apparatus 3 analyzes and determines the reception state of each receiving apparatus.

  The leaky coaxial cable 1aAnt can transmit and receive from transceivers located in the upper left four blocks (AR1, AR2, AR4, AR5) in the same space.

  The leaky coaxial cable 1bAnt can transmit and receive data from transceivers located in the upper right four blocks (AR2, AR3, AR5, AR6) in the same space.

  In addition, the leaky coaxial cable 1cAnt can transmit and receive from the transceiver located in the area of the lower left four blocks (AR4, AR5, AR7, AR8) in the same space.

  Furthermore, the leaky coaxial cable 1dAnt can transmit and receive from the transceiver located in the area of the upper right four blocks (AR5, AR6, AR8, AR9) in the same space.

  Therefore, in the figure, since the transmission signal from the transceiver 2a located at AR1 is received only by the receiving device 1a, the reception information from only the receiving device 1a is transmitted to the information processing device 3 and is sent to the AR1 area. The information processing apparatus 3 can identify that the transceiver 2a is located.

  In addition, since the transmission signal from the transceiver 2b located in the AR8 is received by the reception device 1c and the reception device 1d, the reception information from the reception device 1c and the reception device 1d is transmitted to the information processing device 3, and the AR8 The information processing apparatus 3 can identify that the transceiver 2b is located in this area.

  Furthermore, since the transmission signal from the transceiver 2c located in the AR9 is received only by the receiving device 1d, the reception information from only the receiving device 1d is transmitted to the information processing device 3, and the transceiver 2c is located in the AR9 area. The information processing apparatus 3 can identify that it is doing.

  In FIG. 5, a receiving device is arranged on each floor, and a leaky coaxial cable terminated on the receiving device is laid near the ceiling of each floor, thereby specifying the position of the transceiver on each floor.

  6 shows an X-direction coaxial cable group terminated in the receiving devices 41a to 43a and arranged in parallel in the X direction at predetermined intervals, and a Y-direction coaxial cable terminated in the receiving devices 41b to 43b and arranged in parallel in the Y direction. The position of the transceiver is recognized by laying a group of cables in a grid and identifying which receiving device can communicate with the transceiver.

  For example, the transceiver in the area AR41 is received by both the receiving device 42a terminated in the leaky coaxial cable in the X direction and the receiving device 42b terminated in the leaky coaxial cable in the Y direction.

The central processing unit (CPU) of the information processing device 3 reads the location specifying / management program from the hard disk device (HD), and based on the truth table for each receiving device set in the table, the receiving device 42a and the receiving device 42b. The area AR41 is specified from the combination.

  FIG. 7 shows a case where position specification in a wide range of outdoors (ground, parking lot, school yard, etc.) is performed by combining a leaky coaxial cable and a Yagi antenna.

  Leaky coaxial cables (LCX-A to D) are laid around the rectangular ground.

  In the lower left corner of the figure, a Yagi antenna (Yagi-ANT1 to 3) as a directional antenna having transmission and reception characteristics in a fan-shaped range is shown, and a Yagi antenna (Yagi- ANT4) are each arranged in a vertical polarization mode.

  The leaky coaxial cable (LCX-A to D) is terminated to a receiving device (not shown), the Yagi antennas (Yagi-ANT1 to 3) are also connected to the receiving device, and the information processing device 3 (not shown in this figure). Connected).

  For the leaky coaxial cable (LCX-A to D), the directivity of the Yagi antenna is not extremely narrowed by arranging the receiving device in the middle of each to divide the detection area and divide the detection section. Position recognition is possible.

  For example, when the transceiver 61a transmits in the figure, it is received by the leaky coaxial cable (LCX-B) and the Yagi antenna (Yagi ANT1). Based on the position identification / management program, the central processing unit (CPU) identifies the position of the transceiver 61a by referring to the truth table of the processing table based on the position identification / management program.

  Further, in the case of the transceiver 61b in the figure, the position of the transceiver 61b is specified because it is received only by the Yagi antenna (Yagi ANT1 to ANT3).

  Furthermore, in the case of the transceiver 61c in the figure, since it is received only by the Yagi antenna (Yagi ANT2 and 4), the position of the transceiver 61c is specified.

  As described above, not only the antenna function by the leaky coaxial cable but also the combination with the Yagi antenna having the directivity characteristic in the fan-shaped range enables the transceiver to be located within a wide range.

  INDUSTRIAL APPLICABILITY The present invention can be used for specifying a position at the time of communication with a specific low-power wireless device outdoors (ground, parking lot), indoor (indoor, building, factory) and underground (cave, underground mall).

The apparatus block diagram which shows the whole structure of the position specification system which is embodiment of this invention Block diagram showing hardware configuration of information processing apparatus Chart showing the relationship between the distance from the leaky coaxial cable and the attenuation by the attenuator Explanatory drawing that shows the location system specialized to the two-dimensional space Explanatory drawing showing a state where leaky coaxial cable is laid on each floor in the building Explanatory drawing which shows the state which laid the leaky coaxial cable in the shape of a lattice in the XY direction Explanatory drawing when combined with a directional antenna having transmission and reception characteristics in a fan-shaped range outdoors (ground or parking lot)

Explanation of symbols

1a to 1d Receiving device 1aAnt to 1dAnt Leaky coaxial cable 2a to 2c Transceiver 3 Information processing device 41a to 43a Receiving device (X direction)
41b to 43b Receiver (Y direction)
61a to 61c Transceivers AR1 to AR9 Area AR41 to AR43 Area CPU Central processing unit BUS Bus HD Hard disk device MM Memory DISP Display device KBD Keyboard LCX-A to D Leakage type coaxial cable I / O I / O device Yagi ANT1 to 4 Yagi antenna

Claims (5)

At least two or more receiving devices;
A line antenna for each system connected to the two or more receiving devices and laid in a two-dimensional or three-dimensional direction of space;
Specified low power communication with a transceiver located in the space comprising: an information processing device that identifies the position of the transceiver based on transmission / reception information from the receiving device via any one or more of the line antennas A location system using wireless systems.   The position identifying system using the specific low power radio system according to claim 1, wherein attenuation means for limiting a transmission / reception range with the transceiver is interposed between the line antenna and the receiving device.   A plurality of line antennas are connected to a single receiver, and transceiver information from a single transmission / reception range composed of a plurality of line antennas is transmitted between the plurality of line antennas and the receiver. The position specifying system using the specific low power radio system according to claim 1, wherein combining means for combining is interposed.   The position specifying system using the specific low power radio system according to any one of claims 1 to 3, wherein the line antenna is a leaky coaxial cable.   In addition to the above, the antenna further includes a directional antenna having a transmission / reception characteristic in a fan-shaped range, and the transmission / reception state information from the reception device to which the leaky coaxial cable is connected and the transmission / reception information of the directional antenna The position specifying system using the specific low-power radio system according to any one of claims 1 to 4, wherein the position of the transceiver is specified.

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